﻿/* 
 * Copyright (c) 2011 Jeff Zhang
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of 
 * this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation the rights to use, 
 * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, 
 * and to permit persons to whom the Software is furnished to do so, 
 * subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included 
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

using System;
using System.Collections.Generic;
using System.Text;

namespace Json {
    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
    public abstract class JsonAttribute : Attribute {
        private string _name;
        public string Name {
            get { return _name; }
            set { _name = value; }
        }

        public JsonAttribute() : base() { }

        public JsonAttribute(string name)
            : base() {
            this._name = name;
        }

        public abstract IJsonObject ToJsonObject(object obj);
    }

    public class JsonStringAttribute : JsonAttribute {
        public JsonStringAttribute() : base() { }

        public JsonStringAttribute(string name) : base(name) { }

        public override IJsonObject ToJsonObject(object obj) {
            return obj == null ? JsonString.Empty : new JsonString(obj.ToString());
        }
    }

    public class JsonDateTimeAttribute : JsonAttribute {
        public JsonDateTimeAttribute() : base() { }

        public JsonDateTimeAttribute(string name) : base(name) { }

        public override IJsonObject ToJsonObject(object obj) {
            if (obj == null) {
                throw new ArgumentNullException("The argument must not be null.");
            }

            if (obj is DateTime) {
                return new JsonDateTime((DateTime)obj);
            }

            throw new ArgumentException("The argument is not a datetime.");
        }
    }

    public class JsonNumberAttribute : JsonAttribute {
        public JsonNumberAttribute() : base() { }

        public JsonNumberAttribute(string name) : base(name) { }

        public override IJsonObject ToJsonObject(object obj) {
            if(obj == null){
                return JsonNumber.NaN;
            }

            if (obj is byte || obj is short || obj is ushort || obj is int || obj is uint) {
                return new JsonNumber((int)obj);
            } else if (obj is long || obj is ulong) {
                return new JsonNumber((long)obj);
            } else if (obj is float) {
                return new JsonNumber((float)obj);
            } else if (obj is double) {
                return new JsonNumber((double)obj);
            } else {
                return JsonNumber.NaN;
            }
        }
    }

    public class JsonBoolAttribute : JsonAttribute {
        public JsonBoolAttribute() : base() { }

        public JsonBoolAttribute(string name) : base(name) { }

        public override IJsonObject ToJsonObject(object obj) {
            if (obj == null) {
                throw new ArgumentNullException("The argument must not be null.");
            }

            if (obj is bool) {
                return new JsonBoolean((bool)obj);
            }

            throw new ArgumentException("The argument is not a datetime.");
        }
    }
}
